Progress of the Injector Linac Upgrade for the BEPCⅡ Project

PEI Guo-Xi; SUN Yao-Lin; CHI Yun-Long; WANG Shu-Hong

Chinese Physics C> 2004, Vol. 28> Issue(11) : 1214-1218

Progress of the Injector Linac Upgrade for the BEPCⅡ Project

Institute of High Energy Physics,CAS,Beijing 100049,China

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Abstract：
BEPCⅡ—an upgrade project of Beijing Electron Positron Collider (BEPC) is a factory type of e+e- collider. It requires its injector linac to have a higher beam energy (1.89 GeV) for on-energy injection and a higher beam current (40 mA e+ beam) for a higher injection rate ( 50 mA/min). The low beam emittance (1.6π mm·mrad for e+ beam, and 0.2πmm·mrad for 300 mA e- beam) and the low beam energy spread (±0.5%) are also required to meet the storage ring acceptance. Thus the original BEPC injector linac must be upgraded to have a new electron gun with its complete tuning system, a new positron source with a flux concentrator, a new RF power system with its phasing loops and a new beam tuning system with orbit correction and optics tuning devices. These new components have been designed, fabricated, tested and will be installed in their final positions in this spring and summer, which are described in this paper.

References

[1]

.PEI Guo-Xi et al. Design Report of the BEPC.. Injector Linac, IHEP-BEPC- SB-03-02, 2003(in Chinese)(裴国玺等. BEPCⅡ初步设计–直线加速器, IHEP-BEPCⅡ-SB-03-02, 2003)2. CAO Jan-She et al. Beam Instrumentation Upgrade for the BEPC- Linac, IHEP-BEPCⅡ-SB-03-02, 2003(in Chinese)(曹建社等. BEPCⅡ直线加速器束流测量系统的改进, IHEP BEPCⅡ-SB-03-02, 2003)3. KONG Xiang-Cheng, ZHAO Ji-Jiu et al. Control System Upgrade for the BEPCⅡ-Linac, IHEP-BEPCⅡ-SB-03-02, 2003(in Chinese)(孔祥成, 赵籍九等. BEPCⅡ直线加速器控制系统的改进,IHEP-BEPCⅡ-SB-03-02, 2003)4. ZHAO Feng-Li, HOU Mi et al. RF Components Improvement for the BEPCⅡ-Linac, IHEP-BEPCⅡ-SB-03-02, 2003(in Chinese)(赵风利, 侯汨等. BEPCⅡ直线加速器微波系统的改进, IHEP-BEPCⅡ-SB-03-02, 2003)5. DENG Bin-Ling et al. Vacuum System Improvement for the BEPCⅡ-Linac, IHEP-BEPCⅡ-SB-03-02, 2003(inChinese)(邓秉林等. BEPCⅡ直线加速器真空系统的改进, IHEP-BEPC-SB-03-02, 2003)6. LIU Bo, GU Meng-Ping, CHI Yun-Long. A New Electron Gun Sysytem for the BEPCⅡ-Linac, IHEP-BEPCⅡ-SB-03-02, 2003(in Chinese)(刘波, 顾孟平, 池云龙等. BEPCⅡ直线加速器的新电子枪系统, IHEP-BEPCⅡ-SB-03-02, 2003)7. PEI Shi-Lun et al. Optimization Studies on the BEPCⅡ Future Pre-injector with Two Subharmonic Bunchers. High Energy Phys. and Nucl. Phys., 2004, 28(5): 549(in Chinese)(裴士伦等. BEPCⅡ未来预注入器的设计和优化研究, 高能物理与核物理, 2004, 28(5): 549)8. GOU Wei-Ping et al. The Physical Design of the BEPCⅡPositronSource. Master Thesis, IHEP, April, 2001(苟卫平等. BEPCⅡ正电子源的物理设计. 中国科学院高能物理研究所, 硕士论文, 2001. 4)9. GU Peng-Da et al. Design of the Phase Control System for BEPCⅡ-Linac, Design Report of the BEPCⅡInjector Linac, IHEP-BEPCⅡ-SB-03-02, 2003(in Chinese)(顾鹏达等. BEPCⅡ直线加速器的相位控制系统设计, BEPCⅡ初步设计–直线加速器, IHEP-BEPCⅡ-SB-03-02, 2003)10. WANG Shu-Hong, Gu Peng-Da et al. High Energy Phys. and Nucl. Phys., 2003, 27(2): 173(inChinese)(王书鸿, 顾鹏达等. 高能物理与核物理, 2003, 27(2): 173)

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PEI Guo-Xi, SUN Yao-Lin, CHI Yun-Long and WANG Shu-Hong. Progress of the Injector Linac Upgrade for the BEPCⅡ Project[J]. Chinese Physics C, 2004, 28(11): 1214-1218.

PEI Guo-Xi, SUN Yao-Lin, CHI Yun-Long and WANG Shu-Hong. Progress of the Injector Linac Upgrade for the BEPCⅡ Project[J]. Chinese Physics C, 2004, 28(11): 1214-1218. shu

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Received: 2004-03-30
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Progress of the Injector Linac Upgrade for the BEPCⅡ Project

Corresponding author: WANG Shu-Hong,

Institute of High Energy Physics,CAS,Beijing 100049,China

Received Date: 2004-03-30
Accepted Date: 1900-01-01
Available Online: 2004-11-05

Abstract: BEPCⅡ—an upgrade project of Beijing Electron Positron Collider (BEPC) is a factory type of e+e- collider. It requires its injector linac to have a higher beam energy (1.89 GeV) for on-energy injection and a higher beam current (40 mA e+ beam) for a higher injection rate ( 50 mA/min). The low beam emittance (1.6π mm·mrad for e+ beam, and 0.2πmm·mrad for 300 mA e- beam) and the low beam energy spread (±0.5%) are also required to meet the storage ring acceptance. Thus the original BEPC injector linac must be upgraded to have a new electron gun with its complete tuning system, a new positron source with a flux concentrator, a new RF power system with its phasing loops and a new beam tuning system with orbit correction and optics tuning devices. These new components have been designed, fabricated, tested and will be installed in their final positions in this spring and summer, which are described in this paper.